<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<meta name="generator" content="pdf2htmlEX">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css">
<link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css">
<link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6282d84b3b39c078241de583/raw.css">
<script src="https://static.pudn.com/base/js/compatibility.min.js"></script>
<script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script>
<script>
try{
pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({});
}catch(e){}
</script>
<title></title>
</head>
<body>
<div id="sidebar" style="display: none">
<div id="outline">
</div>
</div>
<div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6282d84b3b39c078241de583/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span> </div><div class="c x0 y2 w2 h3"><div class="t m0 x2 h4 y3 ff2 fs1 fc1 sc0 ls0 ws0">MATLAB<span class="_ _1"> </span><span class="ff3">实例讲座</span></div><div class="t m0 x3 h5 y4 ff3 fs2 fc2 sc0 ls0 ws0">数据分析和统计</div><div class="t m0 x4 h6 y5 ff3 fs3 fc2 sc0 ls0 ws0">赵毅制作</div><div class="t m0 x5 h6 y6 ff3 fs3 fc3 sc0 ls0 ws0">所有程序都在<span class="_ _2"> </span><span class="ff2">MATLAB V6.5<span class="_ _3"> </span></span>中通过测试</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>
</body>
</html>
<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6282d84b3b39c078241de583/bg2.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"><span class="fc4 sc0"> </span><span class="_ _0"> </span><span class="fc4 sc0"> </span></div><div class="c x0 y2 w2 h3"><div class="t m0 x6 h5 y7 ff3 fs2 fc2 sc0 ls0 ws0">数据分析和统计</div><div class="t m0 x7 h7 y8 ff4 fs4 fc3 sc0 ls0 ws0">在本章中将介绍<span class="_ _4"> </span><span class="ff5">M AT L <span class="_ _5"></span>A B<span class="_ _4"> </span><span class="ff4">对数据处理和统</span></span></div><div class="t m0 x7 h7 y9 ff4 fs4 fc3 sc0 ls0 ws0">计分析的命令。<span class="_ _5"></span>如果没有特<span class="_ _5"></span>别强调，本章中</div><div class="t m0 x7 h7 ya ff4 fs4 fc3 sc0 ls0 ws0">的<span class="_ _6"> </span><span class="ff1">A<span class="_ _6"> </span></span>和<span class="_ _4"> </span><span class="ff1">B<span class="_ _7"> </span></span>是指<span class="_ _6"> </span><span class="ff6">m<span class="ff7">×</span>n<span class="ff7">×<span class="ff5">. <span class="_ _5"></span>. .<span class="ff7">×<span class="ff6">p<span class="_ _6"> </span><span class="ff4">的多维矩<span class="_ _5"></span>阵，<span class="_ _4"> </span><span class="ff1">x<span class="_ _7"> </span></span>是</span></span></span></span></span></span></div><div class="t m0 x7 h7 yb ff4 fs4 fc3 sc0 ls0 ws0">一个向量。</div><div class="t m0 x8 h7 yc ff4 fs4 fc2 sc0 ls0 ws0">￥<span class="_ _6"> </span>.1<span class="_ _6"> </span>最大值和最小</div><div class="t m0 x8 h7 yd ff4 fs4 fc2 sc0 ls0 ws0"><span class="fc4 sc0">值</span></div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>
<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6282d84b3b39c078241de583/bg3.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span> </div><div class="c x0 y2 w2 h3"><div class="t m0 x6 h5 y7 ff3 fs2 fc2 sc0 ls0 ws0">数据分析和统计</div><div class="t m0 x9 h8 ye ff4 fs2 fc3 sc0 ls0 ws0">例<span class="_ _8"> </span>1.<span class="_ _8"> </span>创建一个三维<span class="_ _9"></span>矩阵</div><div class="t m0 x9 h8 yf ff1 fs2 fc3 sc0 ls0 ws0">A<span class="_ _8"> </span><span class="ff4">：</span></div><div class="t m0 xa h9 y10 ff8 fs3 fc3 sc0 ls0 ws0">>> A(:,:,1)=[1 2 <span class="_ _9"></span><span class="fc1">3</span>;2 <span class="fc1">3</span> 1; <span class="_ _9"></span><span class="fc1">3</span> 2 1]; >> A(:,<span class="_ _9"></span>:,2)=[2 4 <span class="_ _a"></span><span class="fc1">6</span>;4 <span class="fc1">6</span> 2;<span class="fc1">6</span> 4 2]; </div><div class="t m0 xa h9 y11 ff8 fs3 fc3 sc0 ls0 ws0"> >> <span class="fc1">max(A)<span class="_ _9"></span></span> <span class="_ _9"></span>ans(:,:,1) = <span class="_ _9"></span> <span class="_ _9"></span> <span class="_ _b"></span><span class="fc1">3 3 3</span></div><div class="t m0 xa h9 y12 ff8 fs3 fc3 sc0 ls0 ws0">ans(:,:,2) = <span class="_ _9"></span> <span class="_ _9"></span><span class="fc1">6<span class="_ _9"></span> 6 6<span class="_ _9"></span></span> <span class="_ _9"></span> <span class="_ _9"></span> >> whos</div><div class="t m0 xa h9 y13 ff8 fs3 fc3 sc0 ls0 ws0"> Name Size <span class="_ _9"></span> Bytes Class</div><div class="t m0 xa h9 y14 ff8 fs3 fc3 sc0 ls0 ws0"> A <span class="_ _9"></span>3x3x2 144 double array</div><div class="t m0 xa h9 y15 ff8 fs3 fc3 sc0 ls0 ws0"> ans 1x3x2 <span class="_ _9"></span> 48 double array</div><div class="t m0 xa h9 y16 ff8 fs3 fc3 sc0 ls0 ws0">Grand total is 24 el<span class="_ _5"></span>ements using 192 b<span class="_ _5"></span>ytes</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>
<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6282d84b3b39c078241de583/bg4.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span> </div><div class="c x0 y2 w2 h3"><div class="t m0 xb ha y3 ff4 fs3 fc2 sc0 ls0 ws0">求和、乘积和差分</div><div class="t m0 x6 h5 y7 ff3 fs2 fc2 sc0 ls0 ws0">数据分析和统计</div><div class="t m0 x1 hb y17 ff3 fs4 fc5 sc0 ls0 ws0">求和</div><div class="t m0 xc h6 y5 ff3 fs3 fc3 sc0 ls0 ws0">对例 <span class="_ _2"> </span>. 1<span class="_ _3"> </span>中的矩阵<span class="_ _2"> </span><span class="sc1">A<span class="_ _c"> </span></span>进行求和及累计和，其操作如下：</div><div class="t m0 xd h9 y18 ff8 fs3 fc3 sc0 ls0 ws0">>> TheSum=sum(A), TheCsum=cumsum(A)</div><div class="t m0 xd h9 y19 ff8 fs3 fc3 sc0 ls0 ws0">TheSum(:,:,1) =</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>
<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6282d84b3b39c078241de583/bg5.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span> </div><div class="c x0 y2 w2 h3"><div class="t m0 x6 h5 y7 ff3 fs2 fc2 sc0 ls0 ws0">数据分析和统计</div><div class="t m0 xe h9 y1a ff8 fs3 fc3 sc0 ls0 ws0"> 6 7 5 <span class="_ _9"></span> <span class="_ _9"></span> TheSum(:,:,2) = <span class="_ _9"></span> 12 1<span class="_ _9"></span>4 10</div><div class="t m0 xe h9 y1b ff8 fs3 fc3 sc0 ls0 ws0">TheCsum(:,:,1) =</div><div class="t m0 xe h9 y1c ff8 fs3 fc3 sc0 ls0 ws0"> 1 <span class="_ _9"></span> 2 3</div><div class="t m0 xe h9 y1d ff8 fs3 fc3 sc0 ls0 ws0"> 3 <span class="_ _9"></span> 5 4</div><div class="t m0 xe h9 y1e ff8 fs3 fc3 sc0 ls0 ws0"> 6 <span class="_ _9"></span> 7 5</div><div class="t m0 xe h9 y1f ff8 fs3 fc3 sc0 ls0 ws0">TheCsum(:,:,2) =</div><div class="t m0 xe h9 y20 ff8 fs3 fc3 sc0 ls0 ws0"> 2 <span class="_ _9"></span> 4 6</div><div class="t m0 xe h9 y21 ff8 fs3 fc3 sc0 ls0 ws0"> 6 <span class="_ _9"></span>10 8</div><div class="t m0 xe h9 y22 ff8 fs3 fc3 sc0 ls0 ws0"> 12 14 10</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>
